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                                <h1 id="hadoop-&#x6027;&#x80FD;&#x4F18;&#x5316;">Hadoop &#x6027;&#x80FD;&#x4F18;&#x5316;</h1>
<h2 id="&#x5C0F;&#x6587;&#x4EF6;">&#x5C0F;&#x6587;&#x4EF6;</h2>
<p><strong>HDFS &#x5C0F;&#x6587;&#x4EF6;&#x5F71;&#x54CD;</strong></p>
<ol>
<li>&#x5F71;&#x54CD; HDFS &#x7684;&#x5BFF;&#x547D;&#xFF0C;&#x56E0;&#x4E3A;&#x6587;&#x4EF6;&#x5143;&#x6570;&#x636E;&#x5B58;&#x50A8;&#x5728;NameNode &#x7684;&#x5185;&#x5B58;&#x4E2D;&#xFF0C;&#x5C0F;&#x6587;&#x4EF6;&#x592A;&#x591A;&#x4F1A;&#x5BFC;&#x81F4;&#x5185;&#x5B58;&#x5360;&#x7528;&#x8FC7;&#x5927;&#xFF1B;</li>
<li>&#x5F71;&#x54CD;&#x8BA1;&#x7B97;&#x5F15;&#x64CE;&#x7684;&#x4EFB;&#x52A1;&#x6570;&#x91CF;&#xFF0C;&#x6BD4;&#x5982;&#x6BCF;&#x4E2A;&#x5C0F;&#x6587;&#x4EF6;&#x90FD;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x4E2A;Map&#x4EFB;&#x52A1;&#xFF1B;</li>
</ol>
<p><strong>&#x89E3;&#x51B3;&#x65B9;&#x6848;&#xFF1A;</strong></p>
<ol>
<li>Har &#x5F52;&#x6863;&#xFF0C;&#x81EA;&#x5B9A;&#x4E49;InputFormat &#x5C06;&#x5C0F;&#x6587;&#x4EF6;&#x5B58;&#x50A8;&#x4E3A; SequenceFile&#x6587;&#x4EF6;&#xFF0C;&#x5C06;&#x591A;&#x4E2A;&#x5C0F;&#x6587;&#x4EF6;&#x770B;&#x4F5C;&#x662F;&#x4E00;&#x4E2A;&#x6587;&#x4EF6;&#xFF1B;</li>
<li><code>CombineTextInputformat</code> &#xFF0C;&#x51CF;&#x5C11;&#x5207;&#x7247;&#x6570;&#xFF0C;&#x51CF;&#x5C11;maptask&#xFF1B;</li>
<li><code>jvm</code>&#x91CD;&#x7528;&#xFF1A;&#x91CD;&#x590D;&#x5229;&#x7528;jvm  &#x5C5E;&#x6027;&#x503C;&#x4E3A; <code>mapreduce.job.jvm.numtasks</code> &#xFF0C;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;<code>10</code>&#x6B21;&#x4E00;&#x822C;&#x8BBE;&#x7F6E;&#x4E3A;<code>10 - 20</code>&#x6B21;&#x4E4B;&#x95F4;&#xFF1B;</li>
</ol>
<h2 id="map-&#x4F18;&#x5316;">Map &#x4F18;&#x5316;</h2>
<ol>
<li>&#x589E;&#x5927;&#x73AF;&#x5F62;&#x7F13;&#x51B2;&#x533A;&#x5927;&#x5C0F;&#x3002;100M - 200M&#xFF1B;</li>
<li>&#x589E;&#x5927;&#x6EA2;&#x5199;&#x7684;&#x6BD4;&#x4F8B;&#xFF1A;&#x9ED8;&#x8BA4;80% - 90%&#xFF1B;</li>
<li>&#x51CF;&#x5C11;&#x5BF9;&#x6EA2;&#x5199;&#x6587;&#x4EF6;&#x7684;<code>merge</code> &#x6B21;&#x6570;&#xFF08;10/1&#x6B21; - 20&#x4E2A;/&#x6B21;&#xFF09;&#xFF1B;</li>
<li>&#x4E0D;&#x5F71;&#x54CD;&#x5B9E;&#x9645;&#x4E1A;&#x52A1;&#x7684;&#x524D;&#x63D0;&#x4E0B;&#xFF0C;&#x91C7;&#x7528; <code>Combiner</code> &#x63D0;&#x524D;&#x5408;&#x5E76;&#xFF0C;&#x51CF;&#x5C11; <code>I/O</code>&#x3002;</li>
</ol>
<h2 id="reduce-&#x4F18;&#x5316;">Reduce &#x4F18;&#x5316;</h2>
<ol>
<li>&#x5408;&#x7406;&#x8BBE;&#x7F6E; Map &#x548C; Reduce &#x6570;&#xFF1A;&#x4E24;&#x4E2A;&#x90FD;&#x4E0D;&#x80FD;&#x8BBE;&#x7F6E;&#x592A;&#x5C11;&#xFF0C;&#x4E5F;&#x4E0D;&#x80FD;&#x8BBE;&#x7F6E;&#x592A;&#x591A;&#x3002;&#x592A;&#x5C11;&#xFF0C;&#x4F1A;&#x5BFC;&#x81F4; Task &#x7B49;&#x5F85;&#xFF0C;&#x5EF6;&#x957F;&#x5904;&#x7406;&#x65F6;&#x95F4;&#xFF1B;&#x592A;&#x591A;&#xFF0C;&#x4F1A;&#x5BFC;&#x81F4; Map&#x3001;Reduce &#x4EFB;&#x52A1;&#x95F4;&#x7ADE;&#x4E89;&#x8D44;&#x6E90;&#xFF0C;&#x9020;&#x6210;&#x5904;&#x7406;&#x8D85;&#x65F6;&#x7B49;&#x9519;&#x8BEF;&#x3002;</li>
<li>&#x8BBE;&#x7F6E; Map&#x3001;Reduce &#x5171;&#x5B58;&#xFF1A;&#x8C03;&#x6574; slowstart.completedmaps &#x53C2;&#x6570;&#xFF0C;&#x4F7F; Map &#x8FD0;&#x884C;&#x5230;&#x4E00;&#x5B9A;&#x7A0B;&#x5EA6;&#x540E;&#xFF0C;Reduce &#x4E5F;&#x5F00;&#x59CB;&#x8FD0;&#x884C;&#xFF0C;&#x51CF;&#x5C11; Reduce &#x7684;&#x7B49;&#x5F85;&#x65F6;&#x95F4;&#x3002;</li>
<li>&#x96C6;&#x7FA4;&#x6027;&#x80FD;&#x53EF;&#x4EE5;&#x7684;&#x524D;&#x63D0;&#x4E0B;&#xFF0C;&#x589E;&#x5927; Reduce &#x7AEF;&#x5B58;&#x50A8;&#x6570;&#x636E;&#x5185;&#x5B58;&#x7684;&#x5927;&#x5C0F;&#x3002;</li>
<li>&#x589E;&#x52A0;&#x6BCF;&#x4E2A; Reduce &#x53BB; Map &#x4E2D;&#x62FF;&#x6570;&#x636E;&#x7684;&#x5E76;&#x884C;&#x6570;</li>
</ol>
<h2 id="io-&#x4F20;&#x8F93;">IO &#x4F20;&#x8F93;</h2>
<p>&#x91C7;&#x7528;&#x6570;&#x636E;&#x538B;&#x7F29;&#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x51CF;&#x5C11;&#x7F51;&#x7EDC; IO &#x7684;&#x7684;&#x65F6;&#x95F4;&#x3002;&#x5B89;&#x88C5; Snappy &#x548C; LZOP &#x538B;&#x7F29;&#x7F16;&#x7801;&#x5668;&#x3002;</p>
<table>
<thead>
<tr>
<th>&#x538B;&#x7F29;&#x683C;&#x5F0F;</th>
<th>&#x6587;&#x4EF6;&#x6269;&#x5C55;</th>
<th>&#x539F;&#x6765;&#x7684;&#x7A0B;&#x5E8F;&#x662F;&#x5426;&#x9700;&#x8981;&#x4FEE;&#x6539;</th>
</tr>
</thead>
<tbody>
<tr>
<td>LZO</td>
<td>LZO .lzo</td>
<td>&#x9700;&#x8981;&#x5EFA;&#x7D22;&#x5F15;&#xFF0C;&#x8FD8;&#x9700;&#x8981;&#x6307;&#x5B9A;&#x8F93;&#x5165;&#x683C;&#x5F0F;</td>
</tr>
<tr>
<td>Snappy</td>
<td>Snappy .snappy</td>
<td>&#x5426;&#x548C;&#x6587;&#x672C;&#x5904;&#x7406;&#x4E00;&#x6837;&#xFF0C;&#x4E0D;&#x9700;&#x8981;&#x4FEE;&#x6539;</td>
</tr>
</tbody>
</table>
<h2 id="yarn-&#x7684;-job-&#x63D0;&#x4EA4;&#x6D41;&#x7A0B;">Yarn &#x7684; Job &#x63D0;&#x4EA4;&#x6D41;&#x7A0B;</h2>
<p>Hadoop &#x8C03;&#x5EA6;&#x5668;&#x91CD;&#x8981;&#x5206;&#x4E3A;&#x4E09;&#x7C7B;&#xFF1A;</p>
<ol>
<li>FIFO </li>
<li>Capacity Scheduler&#xFF08;&#x5BB9;&#x91CF;&#x8C03;&#x5EA6;&#x5668;&#xFF09;</li>
<li>Fair Sceduler&#xFF08;&#x516C;&#x5E73;&#x8C03;&#x5EA6;&#x5668;&#xFF09;&#x3002;</li>
</ol>
<p>Hadoop2.7.2 &#x9ED8;&#x8BA4;&#x7684;&#x8D44;&#x6E90;&#x8C03;&#x5EA6;&#x5668;&#x662F;&#x5BB9;&#x91CF;&#x8C03;&#x5EA6;&#x5668;&#x3002;</p>
<p><strong>&#x8C03;&#x5EA6;&#x5668;&#x4E4B;&#x95F4;&#x7684;&#x533A;&#x522B;</strong></p>
<ul>
<li>FIFO &#x8C03;&#x5EA6;&#x5668;&#xFF1A;&#x5148;&#x8FDB;&#x5148;&#x51FA;&#xFF0C;&#x540C;&#x4E00;&#x65F6;&#x95F4;&#x961F;&#x5217;&#x4E2D;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x4EFB;&#x52A1;&#x5728;&#x6267;&#x884C;&#x3002;</li>
<li>&#x5BB9;&#x91CF;&#x8C03;&#x5EA6;&#x5668;&#xFF1A;&#x591A;&#x961F;&#x5217;&#xFF1B;&#x6BCF;&#x4E2A;&#x961F;&#x5217;&#x5185;&#x90E8;&#x5148;&#x8FDB;&#x5148;&#x51FA;&#xFF0C;&#x540C;&#x4E00;&#x65F6;&#x95F4;&#x961F;&#x5217;&#x4E2D;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x4EFB;&#x52A1;&#x5728;&#x6267;&#x884C;&#x3002;&#x961F;&#x5217;&#x7684;&#x5E76;&#x884C;&#x5EA6;&#x4E3A;&#x961F;&#x5217;&#x7684;&#x4E2A;&#x6570;&#x3002;</li>
<li>&#x516C;&#x5E73;&#x8C03;&#x5EA6;&#x5668;&#xFF1A;&#x591A;&#x961F;&#x5217;&#xFF1B;&#x6BCF;&#x4E2A;&#x961F;&#x5217;&#x5185;&#x90E8;&#x6309;&#x7167;&#x7F3A;&#x989D;&#x5927;&#x5C0F;&#x5206;&#x914D;&#x8D44;&#x6E90;&#x542F;&#x52A8;&#x4EFB;&#x52A1;&#xFF0C;&#x540C;&#x4E00;&#x65F6;&#x95F4;&#x961F;&#x5217;&#x4E2D;&#x6709;&#x591A;&#x4E2A;&#x4EFB;&#x52A1;&#x6267;&#x884C;&#x3002;&#x961F;&#x5217;&#x7684;&#x5E76;&#x884C;&#x5EA6;&#x5927;&#x4E8E;&#x7B49;&#x4E8E;&#x961F;&#x5217;&#x7684;&#x4E2A;&#x6570;&#x3002;</li>
</ul>
<blockquote>
<p>&#x751F;&#x4EA7;&#x73AF;&#x5883;&#x4E2D;&#x4E0D;&#x662F;&#x4F7F;&#x7528;&#x7684; FifoScheduler&#xFF0C;&#x9762;&#x8BD5;&#x7684;&#x65F6;&#x4FAF;&#x4F1A;&#x53D1;&#x73B0;&#x5019;&#x9009;&#x4EBA;&#x5927;&#x6982;&#x4E86;&#x89E3;&#x8FD9;
&#x51E0;&#x79CD;&#x8C03;&#x5EA6;&#x5668;&#x7684;&#x533A;&#x522B;&#xFF0C;&#x4F46;&#x662F;&#x95EE;&#x5728;&#x751F;&#x4EA7;&#x73AF;&#x5883;&#x7528;&#x54EA;&#x79CD;&#xFF0C;&#x5374;&#x8BF4;&#x4F7F;&#x7528;&#x7684; FifoScheduler&#xFF08;&#x4F01;&#x4E1A;&#x751F;&#x4EA7;&#x73AF;&#x5883;&#x4E00;&#x5B9A;&#x4E0D;&#x4F1A;&#x7528;&#x8FD9;&#x4E2A;&#x8C03;&#x5EA6;&#x7684;&#xFF09;</p>
</blockquote>
<h2 id="hadoop-&#x53C2;&#x6570;&#x8C03;&#x4F18;">Hadoop &#x53C2;&#x6570;&#x8C03;&#x4F18;</h2>
<ol>
<li>&#x5728; <code>hdfs-site.xml</code> &#x6587;&#x4EF6;&#x4E2D;&#x914D;&#x7F6E;&#x591A;&#x76EE;&#x5F55;&#xFF0C;&#x6700;&#x597D;&#x63D0;&#x524D;&#x914D;&#x7F6E;&#x597D;&#xFF0C;&#x5426;&#x5219;&#x66F4;&#x6539;&#x76EE;&#x5F55;&#x9700;&#x8981;&#x91CD;&#x65B0;&#x542F;&#x52A8;&#x96C6;&#x7FA4;&#x3002;</li>
<li>NameNode &#x6709;&#x4E00;&#x4E2A;&#x5DE5;&#x4F5C;&#x7EBF;&#x7A0B;&#x6C60;&#xFF0C;&#x7528;&#x6765;&#x5904;&#x7406;&#x4E0D;&#x540C; DataNode &#x7684;&#x5E76;&#x53D1;&#x5FC3;&#x8DF3;&#x4EE5;&#x53CA;&#x5BA2;&#x6237;&#x7AEF;&#x5E76;&#x53D1;&#x7684;&#x5143;&#x6570;&#x636E;&#x64CD;&#x4F5C;&#x3002;dfs.namenode.handler.count=20 * log2(Cluster Size)&#xFF0C;&#x6BD4;&#x5982;&#x96C6;&#x7FA4;&#x89C4;&#x6A21;&#x4E3A; 10 &#x53F0;&#x65F6;&#xFF0C;&#x6B64;&#x53C2;&#x6570;&#x8BBE;&#x7F6E;&#x4E3A; 60</li>
<li>&#x7F16;&#x8F91;&#x65E5;&#x5FD7;&#x5B58;&#x50A8;&#x8DEF;&#x5F84; dfs.namenode.edits.dir &#x8BBE;&#x7F6E;&#x4E0E;&#x955C;&#x50CF;&#x6587;&#x4EF6;&#x5B58;&#x50A8;&#x8DEF;&#x5F84;dfs.namenode.name.dir &#x5C3D;&#x91CF;&#x5206;&#x5F00;&#xFF0C;&#x8FBE;&#x5230;&#x6700;&#x4F4E;&#x5199;&#x5165;&#x5EF6;&#x8FDF;</li>
<li>&#x670D;&#x52A1;&#x5668;&#x8282;&#x70B9;&#x4E0A; YARN &#x53EF;&#x4F7F;&#x7528;&#x7684;&#x7269;&#x7406;&#x5185;&#x5B58;&#x603B;&#x91CF;&#xFF0C;&#x9ED8;&#x8BA4;&#x662F; 8192&#xFF08;MB&#xFF09;&#xFF0C;&#x6CE8;&#x610F;&#xFF0C;&#x5982;&#x679C;&#x4F60;
&#x7684;&#x8282;&#x70B9;&#x5185;&#x5B58;&#x8D44;&#x6E90;&#x4E0D;&#x591F; 8GB&#xFF0C;&#x5219;&#x9700;&#x8981;&#x8C03;&#x51CF;&#x5C0F;&#x8FD9;&#x4E2A;&#x503C;&#xFF0C;&#x800C; YARN &#x4E0D;&#x4F1A;&#x667A;&#x80FD;&#x7684;&#x63A2;&#x6D4B;&#x8282;&#x70B9;&#x7684;&#x7269;&#x7406;&#x5185;&#x5B58;&#x603B;&#x91CF;&#x3002;yarn.nodemanager.resource.memory-mb</li>
<li>&#x5355;&#x4E2A;&#x4EFB;&#x52A1;&#x53EF;&#x7533;&#x8BF7;&#x7684;&#x6700;&#x591A;&#x7269;&#x7406;&#x5185;&#x5B58;&#x91CF;&#xFF0C;&#x9ED8;&#x8BA4;&#x662F; 8192&#xFF08;MB&#xFF09;&#x3002;yarn.scheduler.maximumallocation-mb</li>
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